The harder you dribble in practice, the harder you’ll dribble in the game. The harder you dribble, the faster the ball moves and the harder it will be for defender the steal the ball from you. The fast dribble will also help you make quicker moves and get past your defender. When you dribbling the ball hard and fast, it’s almost like you’re moving in fast forward speed, especially compared to your teammates who will be dribbling slower than you’re.
Dribbling hard will also improve your arm strength. Which is never a bad thing in basketball. That strong arm will ward off the defenders. You’ll be able to swat them down like flies.